1 files changed, 145 insertions, 0 deletions
diff --git a/plat/juno/aarch64/plat_helpers.S b/plat/juno/aarch64/plat_helpers.S
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+/*
+ * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <bl_common.h>
+#include <cortex_a57.h>
+#include <cpu_macros.S>
+#include <platform_def.h>
+#include "../juno_def.h"
+
+	.globl	plat_crash_console_init
+	.globl	plat_crash_console_putc
+	.globl	plat_report_exception
+	.globl	plat_reset_handler
+	.globl	platform_get_core_pos
+	.globl	platform_mem_init
+
+	/* Define a crash console for the plaform */
+#define JUNO_CRASH_CONSOLE_BASE		PL011_UART0_BASE
+
+	/* ---------------------------------------------
+	 * int plat_crash_console_init(void)
+	 * Function to initialize the crash console
+	 * without a C Runtime to print crash report.
+	 * Clobber list : x0, x1, x2
+	 * ---------------------------------------------
+	 */
+func plat_crash_console_init
+	mov_imm	x0, JUNO_CRASH_CONSOLE_BASE
+	mov_imm	x1, PL011_UART0_CLK_IN_HZ
+	mov_imm	x2, PL011_BAUDRATE
+	b	console_core_init
+
+	/* ---------------------------------------------
+	 * int plat_crash_console_putc(int c)
+	 * Function to print a character on the crash
+	 * console without a C Runtime.
+	 * Clobber list : x1, x2
+	 * ---------------------------------------------
+	 */
+func plat_crash_console_putc
+	mov_imm	x1, JUNO_CRASH_CONSOLE_BASE
+	b	console_core_putc
+
+	/* ---------------------------------------------
+	 * void plat_report_exception(unsigned int type)
+	 * Function to report an unhandled exception
+	 * with platform-specific means.
+	 * On Juno platform, it updates the LEDs
+	 * to indicate where we are
+	 * ---------------------------------------------
+	 */
+func plat_report_exception
+	mrs	x1, CurrentEl
+	lsr	x1, x1, #MODE_EL_SHIFT
+	lsl	x1, x1, #SYS_LED_EL_SHIFT
+	lsl	x0, x0, #SYS_LED_EC_SHIFT
+	mov	x2, #(SECURE << SYS_LED_SS_SHIFT)
+	orr	x0, x0, x2
+	orr	x0, x0, x1
+	mov	x1, #VE_SYSREGS_BASE
+	add	x1, x1, #V2M_SYS_LED
+	str	w0, [x1]
+	ret
+
+	/*
+	 * Return 0 to 3 for the A53s and 4 or 5 for the A57s
+	 */
+func platform_get_core_pos
+	and	x1, x0, #MPIDR_CPU_MASK
+	and	x0, x0, #MPIDR_CLUSTER_MASK
+	eor	x0, x0, #(1 << MPIDR_AFFINITY_BITS)  // swap A53/A57 order
+	add	x0, x1, x0, LSR #6
+	ret
+
+
+	/* -----------------------------------------------------
+	 * void platform_mem_init(void);
+	 *
+	 * We don't need to carry out any memory initialization
+	 * on Juno. The Secure RAM is accessible straight away.
+	 * -----------------------------------------------------
+	 */
+func platform_mem_init
+	ret
+
+	/* -----------------------------------------------------
+	 * void plat_reset_handler(void);
+	 *
+	 * Implement workaround for defect id 831273 by enabling
+	 * an event stream every 65536 cycles and set the L2 RAM
+	 * latencies for Cortex-A57.
+	 * -----------------------------------------------------
+	 */
+func plat_reset_handler
+	/* Read the MIDR_EL1 */
+	mrs	x0, midr_el1
+	ubfx	x1, x0, MIDR_PN_SHIFT, #12
+	cmp     w1, #((CORTEX_A57_MIDR >> MIDR_PN_SHIFT) & MIDR_PN_MASK)
+	b.ne    1f
+
+	/* Change the L2 Data and Tag Ram latency to 3 cycles */
+	mov	x0, #(L2_DATA_RAM_LATENCY_3_CYCLES |    \
+			(L2_TAG_RAM_LATENCY_3_CYCLES << \
+			 L2CTLR_TAG_RAM_LATENCY_SHIFT))
+	msr     L2CTLR_EL1, x0
+
+1:
+	/* ---------------------------------------------
+	* Enable the event stream every 65536 cycles
+	* ---------------------------------------------
+	*/
+	mov     x0, #(0xf << EVNTI_SHIFT)
+	orr     x0, x0, #EVNTEN_BIT
+	msr     CNTKCTL_EL1, x0
+	isb
+	ret